WildFire 101: Haines Index

Haines Index is used to indicate the potential for rapid fire growth due to dry and unstable atmospheric conditions over a fire area. The index is a simple way to measure the atmosphere’s contribution to the fire’s growth potential. A high Haines Index is correlated with large fire growth where winds do not dominate fire behavior.

During days with a high Haines index and a Lightning Activity Level (LAL) above 4, fire behavior can become very erratic, unpredictable and difficult for resources to control and contain.

Haines_Index_Table.jpg 

2014 Incident Response Pocket Guide, Page 65

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